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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2bd303f08ee297bb69c7fe4f9d36e5cf1469baf27b46894460b44ac59145ccf' 
  AND token = 'I5CZybZE6oP/8Dkd8R8iN+o7k2fx5mpmxg/o9b/gu5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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