SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43c17bc30a16680272c93d2331c2ba5358697953cef88a56b9c465b8da45610a' 
  AND token = 'QuzANxKFYUcjSJ5K5wGQZ9KlD8wjdB6YSv/9QAwdZXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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