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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '811ed79f57ca8e13f727c616d9fbc73465088b6d861dbc45cf38839ba8326028' 
  AND token = 'nYI30Q0zON0sFa8ISDmgtUbEGIJR4mAAedppkaHdZTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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