Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43849ab8777352eae8877dbc3242de09b4744429491fbf7bb1f8a8fba33e13f8' 
  AND token = '5bCO0lBU2xqnb8Iez6IbmY9JFsZ70FwwKpQNZh5+lTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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