SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26285bc72e14574cb5a1bb39754b7fd745949dc4622e4af25efc1c32983cf085' 
  AND token = 'MvchbfpUqfxhtY3W8tBrSJkKVPmdPabYUDjwC7HGb5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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