SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fbad848f72b33df35eab7b825a5fb39a79c97c0f5f8ed11475d01d90dd1f609' 
  AND token = 'sPTn6OG7LkaxuGNmDDRgmJ2oBJsCpXfP89KlKBIW6qQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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