SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '724db67534b878ed6ff92b06e7e433ebbf5fba8c6c6dcfb19ce79af9c7cc24e4' 
  AND token = 'ooSZU5EOwYxT8hguPIG6ffeJ7XR0YsK+JB3Zz1nmv1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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