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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '324bacbc4926187ef50b924755d0a69f1643024f84306845f7a49de65861151d' 
  AND token = '3hw2wOPE6HN42QqJ/of17o5x6MI7nQjsea1vN4l7v7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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