SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32f8f2722551a339d4d0db43191d96bd9bc4f6ab28342cb2d0dc355c0d6e5c71' 
  AND token = 'G/g5bp4j8cqck9aWLNeKdLXhhCVBhR9x+jpWYj0NSPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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