SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24eda0b005e48203b909ef85152560f3e1ea36fa4ba994bc9c900f0681e238c1' 
  AND token = '7ZwrdvjZBolgPfsdpG161y/wAL7sOKEzvYWOhUxV9Rk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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