Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae0971a1da0576f3973342a25af94830204c31fff9ad9d3323afaea17cfd7563' 
  AND token = 'XmXprD1szACP4w/5fJqcwruWlotdURVyBNWzlp4MDZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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