Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8c02ff0515f7a85f6461f459454a9f01401b281247fbdb989b038162ffe425d' 
  AND token = 'Md38j54/UoRtG2gqqs6j+dfWpji+c6aml7HxvfAQJyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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