SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4882945702a3879c7ddd8e26781a03dc3c793ed357b6becfce097697b3274c1' 
  AND token = 'BPkZV+2X8GikmmDT3e/O9GMssAv8MFzalr7xuKly0q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

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