SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64d1831b52294ede210911881aa7ef7c1cfd3053e4ea3614fc7af1d5c975f0a4' 
  AND token = 'G5rT6A/0TAmQ5BGikIZ8DsbXfgYhMTqad/EfqUKJ+zI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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