SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b97435e00c2682305badc8d49d30274890bb3e73e9d91ffdc4f296976130b6f' 
  AND token = 'u8PPwWU5t91ynhCujBjPQSrd6BBafOzJ5a+m8bIv5sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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