SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f106fda139b52c64d73d1e0633c8271712e97c5dde92ebd83de40c89862354dc' 
  AND token = 'KOzSf2yHe7TRjxRYJ4ppZkpMqWwryGZbw8VgqDtLTvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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