SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fde07ba88d2d2844c399f8f55ccd566547266c497b7c2f609875116b76fe59a5' 
  AND token = 'QDhhZnSHU4lkQAqqhVaMxWwoSAE/YUOMGKALcrIsY5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

Explain
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE Impossible WHERE noticed after reading const tables