SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7debc697ca1c668543fd20d7fbd91774b9ab925ce677680cd94e247228f6fe03' 
  AND token = '9XVrx3v/H5YsUJfChLfoX8wgOyRen6BdNjR5lwSjPO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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