SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ae47bc9824f7edefad8c54dd0164eb72a51ba90299d629ea795b7e1a59c3355' 
  AND token = '/OTkIjSFvexPmgkEoUWMGQ/1cW3FnXUTsn9P1r1cKsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

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