SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0aefd7367b2befbd61ed323af0b2b5658f7cf046693962251ecbd1cf0db3c0a' 
  AND token = '3XtLJW6wV2p8Kn+CGFPl9VKZqEIWlzMUl5Rqww7WSxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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