SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfb4e93710d7830f73ad45a1952fde117c177dd79d7d694a27592efb03a18054' 
  AND token = 'MmrqLz0i+NdUqtXQNkDminqHxSkHh2p7ECanityrVGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

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