SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62a395f6142fb7f316b76b1c6e7af98f6c71b94c8a548bb9f13a5200392ce64c' 
  AND token = 'OCB23yrwJXNrrjK9uX+gsDtl5LuYRonZd/aN23bCTCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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