SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '468a6f24618f9374b4ebc1ec02fb91d1f22cea28bcdd9a866676f6c8a35cb7bf' 
  AND token = 'Sy7rpZrbQKGUzeByvGvYVCZZYrUz2zIqa89CmlO9lRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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