SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad2846253040e51631e98bb7eeff33bd63839384f20e972ccc5648d8fdcf2772' 
  AND token = 'P2quDxZxKLke9YO/fU7C8ohlsJW+1r4AuqFvowUUvvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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