SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '882931cc1b4d216c4430fac94bd6d3095bf3d070daededd695c92101a4794786' 
  AND token = '7M5h9LjutX4Khx0PTonzHFvENwQvNOm0Me1MI5/EZMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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