SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f660820269b8e3657e23df4f17b38c4e87a09b5508e76edc5ea95e7cef050833' 
  AND token = '4Yjdpfy+HKFihMSPoozUSB+V3y/0mBL1cw5GYkwipg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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