Locate the recording of interest and view the full record (complete with the image of the cover art at the left).
In the left-hand column, look for the Show Static URL button
You now will see the URL of each track appearing underneath the track's artist and title information.
Please note, that (unlike most of the other providers, Naxos has embedded proxy information into the stable URL they provide. You will not need to include the "proxy prefix" but can use this URL as given.