SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd55c8d9064a120e0d549cd9dad4a60066ca17e56ca0a808530386a1b879f71c' 
  AND token = 'nJANom5clxTI9+NCRdZioRfyqaP6KvOfgOwfKeYAIp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

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