SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '298de8a94b787f8387a0fc87d5c4f85426625ed5a92f15ad1d55be30d179a37a' 
  AND token = 'KvTS6pLx6Hh/UsiBlurNsxKtBpCSo7CU9o9Z9SYLZqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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