SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddf24863e0f0ce8ddac4cd127e86e25a8abe2901928d831b5e906a248b18f175' 
  AND token = 'yVvdD6PFZYFeLuNjT3/pvmQUTUBZD7fgMqN6JkRG+Xs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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