SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8c17d3edb49385c30f995887e3f3375cc7c3660129ca9a83b682ffb04aed6c4' 
  AND token = 'bvvzpnpvhV8g9Mjj5KG5W9nwcAYM3Jkgw/hbyfpf7FI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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