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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13acb5fc383c0615c44d6ef2acb219b01cf787c6a3f4619f0448077c82778547' 
  AND token = 'vi7mMF/1dMl65Vswi5pd+08nZYTsUXs8jgnwqMoruNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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