SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c0124f66a8b455866479c532e5d7f64e0bc326b33fccd135568dc6e7a881ac5' 
  AND token = 'Zxxoqs/+9/hyOfcnSWvixZdWCVVgj96IMz/zDf+suGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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