I claim the ornamental design for a jewelry box lock, as shown and described herein.
FIG. 1 Is a front perspective view of my jewelry box lock with the dotted line illustrations being for illustrative purposes only and to which no claim is made;
FIG. 2 Is a front view of my jewelry box lock;
FIG. 3 Is a top plan view thereof with the bottom plan view being a mirror image thereof; and,
FIG. 4 Is a right side elevational view thereof with the left side elevational view being a mirror image thereof;