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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b0ab2349b994fba161e8b93cf4cf023d9f573554141caa7287fdf93df448217' 
  AND token = 'DhDq1ojUQJef8O+SM3U6C7Vmd3k+mKP1WTOFkG2azC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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