It's probably the most common lock out there. I use them on cabinets all the time in bars, restaurants offices and homes etc.
There are more key numbers available. If I carried about three numbers I could open almost any of the locks.
Easy enough and cheap enough to change the lock if it makes you feel better. May not actually improve security much though.
The locks should be available at most hardware stores for a few bucks.
Check the key number when buying, and the shaft length, so you get a proper fit.