SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d06376a49c29e1e8a4610e3538b0dc15e9475faeaf89577b89da0a2ba9c8d78' 
  AND token = 'ow3HEfLfvGh9QS4IjgzVn4Bhg1mwruvjs9rJ01JwPlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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