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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94d28ac9816a5944c47d051c8bef12685f4996d7cbc5cdfcf3c4c794e883a41c' 
  AND token = 'VFgj9e5GPj6/V9b1yM/HoeCWrI8ZIw0JgUGh8iGqoXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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