SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3e740652896673aa1266e1c8077062598c4f2d7e62ad8aea101b614de4b336f' 
  AND token = 'vuGbb3KG5DYzKjgn8/8FddnN2/kY57vqwXfrJYWG3Wk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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