SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b092a86b8233a2e3c5b9c64f2bf18493b9dd5149701ad1f86cbf979e14010404' 
  AND token = 'VXvftNKs4jlP3aq/vTzh7J9C8qtuJ6XruTbG0nSjPDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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