Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '520ee420ded6ad17805130487d40272e739500043e22a39802e76b7c4abdb1b6' 
  AND token = '/1fUa6sKgwKJKyAGJmJL50sExg4z1dADhTMuvLtXZFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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