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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1b60b8387a27300e46d9c6be0ae8049048677e385b1942de1f9069b47e60b2f' 
  AND token = 'fUgad6rczIkgQ+UNNck8ywufl0Kg3KCcwmqd6MehY/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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