SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c7abe5d796c98017f6595b26ed188661d63c626ee245e46afa185954e30ebf7' 
  AND token = 'qIJ5HQySDtC+lolTKYzC8rl94X/A3h3MwipJhjOHBpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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