SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4bd0652507a9d17a6a4c1c0a8dbdf6c08016bf1ac026e1d1dd42a4bd6cd78f0' 
  AND token = 'x625GNqWPgC0oABKFwjCom/eSfF64fu5svqQfgAFtkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

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