SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95f51d30ff1fb26f16eb30409d2b7f2beeaf5786692954b23d5833d4de5b9d05' 
  AND token = 'g+DQXWHlQgnI/vjTSt0G0AkL4CKh5VN4sJo+HeqANzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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