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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'add3adaebf49ea2f45e612292297885f4b1fd60221d2443d239b7ef4b9d14edd' 
  AND token = 'MkLhQp1fEpL7TmP8SpgwTa1X4mBK6jB9Bs2uozYAGtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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