SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94658e5304843ccf7a96389de5ccbe5071ef43e8a04549f725760f173529cf5b' 
  AND token = 'Pa0Rq0HUyJUVuP2omZJhkUEtJnbS8EzKJz/V+vZbi2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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