SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f16a5bef37b4696bfa315425f537c832f49aeb4a662d6bf03f02f9363b8c15f' 
  AND token = 'YQnX/A2FHPx9mPq+OoYaniZg+j5Gbdb8g9L/J5ySjZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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