SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2f301904d863d0dc405a8cff585dd5383e5925191a2a1aa501c74d53e2476af' 
  AND token = 'IZqYoZV4JSd9yhR2vJ7BmgzroWLLJcvAwOSGmdJFzY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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