SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c7684eab55532629d216386b32f09e35733c90e8f76dfc40b05d91d94d21a97' 
  AND token = 'm8Lth8dmO8jsQkJag1uMDhYzcYK50+UqQp7ej22WxGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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