SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4061479729494aa18379c8c1267fc09110c377a7490a305f31be55873d0f49aa' 
  AND token = 'O+64GAKsYSiJ2IwNfrQfJusKGRu6h4JPvWKI/1Ai+Lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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