SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '364e92cab7359623f7f256d92bb30926b36fc40e6f4f7fe98cdb5848d7e80f04' 
  AND token = 'J/vTx4+ixWDMsZKezimg2ZhpGf2JC8LICWN5f13zVuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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