SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '644177fc657db9b355b3560420d1a67f97c3155835d0fd5fb63f28e345a8e888' 
  AND token = '1e/KRrrXb7/IKixRUGtbYSX/tjJRwW6/V4H9dqy/pFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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