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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c44ab9694b4effbca86c5cbbe3165331d7d415be23280821edc46e9924ce299a' 
  AND token = 'VIayPl9bXLNvUhX+tUOcUzh3w7j9tit1kBTD2NrykjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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