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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '328f58e92a61c24049d0f53d5dc91a5d5326dedc7c4ece81a4fb3fc75be68a8b' 
  AND token = 'lYrkapXhF55MeaEPnD9xtj6SBAWvz1KnaCbHKJEUULI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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