SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69229288a4ad48cefe4b2166d738184e00f3d3a3cf9c7fbe1b44e8e76a74dfc7' 
  AND token = 'Bxwu74+d5anYVhK9QMdaDZ7G9ygG+IBsMlJ2zI4TXdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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