Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6daeb26bb012f58d66a4f87d6224051db675a7041d40cad2d11fd427f3d14e1' 
  AND token = 'D6UXSM4J7sOqbKcVbCVARxYOuAXa+lk6KPfyb0DqrMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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