SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '143d78771698b7204af99d2266a67ec65d06d596797de91dbb4a7525f0d996bc' 
  AND token = 'qeKg/8mZl2tU/4V+aAV/zqZnKPmISwgg0MNkDqG/iwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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