Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f1c18adedbb4022430cf9dc665c8d37d6d56abc2c56a361b653ff719ece5c33' 
  AND token = 'eOqnOoa0nX2HhMWRLbCcmKyEuvSyGN30lgIt+ow3Cac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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