SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fb62d8835e9c1e7a454cc88260ffea71477f3bed7ae059687cee674f00c7d64' 
  AND token = 'kZGlPT2ztYJQ0oCSJGwt0Q1XFih9/93FgpavjIFDe/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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