SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67b07b3155847c00cbebf512dc9e16f9c1794cc392a7511a31f0d28630af572c' 
  AND token = 'oghQd8XLRC3qlr17B8zu+YmY2CIZkuRFGZqFX0hXu3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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