Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '863ebd22a1e3184cd4b10e635576efffdef4e08c08e7be60051933785ed046c4' 
  AND token = 'xUOzF5K544q33LK/mTWmfjmcC/jLsW23p6AjhZYEy1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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