SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de7f89bfc8db57f1df2c90bd74af75dfa4de49d91f9a4aff57c71f5947c97ad3' 
  AND token = '8ZpCretlqN5V6Y/WzK7N7RTmNNr8bjdL+lL7ee3LSJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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