Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2ddf3bafbb8505ab512111a3425b81b38c020e7db85126cb8e1cc753296d355' 
  AND token = 'IwTqvFLuNOoczHgA5FTopsD+GWLwX7isQPiyL+xjdY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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