SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06d7fd0e7b08b8ae56bffab7c9c650d7f299f1f863a51894261838e1ec93f167' 
  AND token = 'pGpC9i/hol+NQj0StXWFPB7qcYCgiXYwNAQ6BBz/7Jo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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