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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6997bcc4f768e42d0fefa7ee9e82300d86249dc725a4b27a4eff3d74ba897e0f' 
  AND token = 'nbwajJCrhcOhTeMbni0zf9BiAdUbFb9Q7wtZghlH8/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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