SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63afbc5e9135274b793ba83c30b47fdd20636c72ac4635049efaf0f813261131' 
  AND token = 'nYvabKZzEjRLjLHVX/oH/HKpQt8d1B9yX5IrN4dhcx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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