SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd418889e3af0f9ddd49a9b3b75db7e3096629bad69115a9caa54ddcdbd8619d9' 
  AND token = 'YZvuhjuPz8fq/GhpxgXFSFkwF0sl9DECEQwj6hxesPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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