SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84e772d1261b6247d58849745223306bcc257528cc33713cc11bc09197e63eaf' 
  AND token = 'cLSWdyhMCtV5IqaggWv9glumZ2Gw6ulrd/oZOJqjt/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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