SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '094463b47ab59667a564e3f1d36e9fc91696dd0a8e337e0a10b6d56d2a1dcdb5' 
  AND token = 'IGw4UZ23YZWdN+TG8W7tcJGDzgVGBdn9KGIvwoCjIT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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