SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcb1b34a93a9f8585f4a89a7da93ec7f60acde81237ae24f8c9d5e3f6412e2b6' 
  AND token = '7ANCzB1FYDjZSdG0XKZihH9re2TuTkvld8xEdqVxaXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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