Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca1dc29cd2ea74b8541b6f53a453e00acdba4f0eb7c7d80751a1c30302e53d3a' 
  AND token = 'W8mLi4Oq9DqDzFWv2kpOeA+Jukqutb7pEU7NyTk1gHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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