SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ffba736aba57203d549d6384ad36f3583dc3a0c9a0032d12c441a21a853f30f' 
  AND token = 'LqrfLX+D87b1KAi8kB3SYgyEwGCxOKKa3oAAh4uNEsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

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