Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6bbc582ffbee68458033ae6b7f3373df8f003e2521698f99782d0e4d0adeff5' 
  AND token = 'gskFyU3bJYBs5qh0/nW36GE+U+cFZdBWzzOSWhrrbAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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