Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89fedc6bbb29d7258484aafde49a59a61f6752ec8c80d3bf294df53ac98ba56a' 
  AND token = 'n2+uQfEaXiZj4n26xysLvp6g/zlY3twgadnwkjxRdW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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