SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f40d79d5b5c6828654eaa3cb27928bb2b64bd7d1ca5624454b8d7196b82d512' 
  AND token = 'QCzS7pLkG6LYoXSwRR4hCWv3skaYNWKIvSnfjQYGCPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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