SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44b404287238e8f1c162a6f76b3f4f4da3cda211425976df91b3e28b7078fe19' 
  AND token = 'GcbZ5tqCFvjnV8hi0I0WKT27XBRPjq9qzscLjPGsPAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}