Afaik that's just some tubular pin tumbler lock.
The keys were usually interchangeable between PCs als long as they had the right diameter so you should find what you're looking for at a hardware store.

they're usually very, very simple. And, most of them seem to be pretty much the same.

Doornkaat is right and if that doesn't work, think out of the box: Remove the Keylock from the box and replace it with a new one that came with keys.
https://de.aliexpress.com/item/32811760147.html

That might even be the cheapes way to get some key without removing the lock.

I also had a case with such a lock, not for the keyboard lock but for physically locking the case, and I ended up ordering a new lock+key on AliExpress, the only place I could find something like that. I had to transfer the 'blade' from the old lock to the new assembly, which took a bit of filing to make it fit.

A large HP server came to me without keys, however on disassembly I found two keys (and a driver disk) taped to the exterior of one of the SCSI drive cages.

Many of them are "one key fits all" or have a very small selection of keys... A computer club I went to in the 90s had a small keyring with a dozen on, and said they haven't found anything they can't unlock with them. There is also a technique where you can jam a pen barrel into the lock and rotate it. Though mess that up and you'll be picking broken plastic out of it for weeks if you wanted to keep it original.

Anyway, high security it is not, prevents opportunistic rather than targeted entry, can usually be replaced at a hardware store.

When I was a teen in 1992, I used the pin of my watch bracelet latch with great success and ease .

My parents weren't happy, but soon gave up trying to limit my computer access anyway.