SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b520e2733d5300eec40023d2f831a4962fcf429c70a1284122af8b2fb47743a6' 
  AND token = 'HDH8DaZuGluWJp7QqbX+dn/tfqkWYHhTVxf3i+ivu/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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