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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f2b5976b7fb5d440401eed6fa4f72c31e69c41e36e560e11a2df201207f3103' 
  AND token = 'kUztrhrSIX+NqKUgynZah1YE5jcBYU/aSTm2BdSFlgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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