SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47f79c624b05255207c4cfc017e0308646c996b3d6d6a0a113f6b94688e09601' 
  AND token = 'NQPZpgaZVwW4uiu57qzP8LzSRNoYaHz+HKRSn1uCBrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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