SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cb561b5086ecfd74eda1f7d44a8d458609c14232e757bbd761670ad69c05557' 
  AND token = 'LOmciTqMwe844K6rAXkBHj8Yz7ZA1ZnJHvCG+lrLZ2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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