Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '802370ab7356a87931edb120ed28144246b3803ffe64c7c0bee8581f1e0a20b9' 
  AND token = '4xf99NwWu+7pY6FU00v8wwG30BRuT95LaI+AAz5b7tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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