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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c83d01e4149ea6c830fdd9c990f4d4813d6f018e561efdb3eac945636013bb84' 
  AND token = 'oGp0lqhf3vp+uQa+X3ISMTJy1hnBHylsDxJrm2C3eb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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