SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f2a95e148de91b37e20556d5a495bab14c9c98461aa22011f12a56a76337a78' 
  AND token = 'ZyNhB7YxnuCKj5hGOC/oG9KY58Iowlq0kl2PMBtKfQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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