SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac619eeda450af7e7fdbfbadabd47f030647df7a8e4569e1fbaafee86dd79810' 
  AND token = 'qF69Vs5mRFg768KtPApo1osoGQh5eKVZamGhuO4rGwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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