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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bf509fd8b51f856c214cc7b50a8aa19138e1d9bdacfd834d180bff1be179cea' 
  AND token = 'ROG9AF5bYIEiKsS5CekkgYo08dpOwuqU/21+AYXpCl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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