SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64529ca8b8d4a9e43648e6fa65c07d750440ffa600441341fa9e7db4e8a68e75' 
  AND token = '0OsOdIl1BPPkSqSDqCLIPdwqBV7AahKDP6+dZnjwtcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

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