Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4c7419eabb94e10ccd9b3c918dcd734d44203e967c0c34fc3ce7001c972b07c' 
  AND token = 'lnIdWSpj5c+qquRUnTvVJUEGGH3DBD3Oh9O0h9JR+Do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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