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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04c7db3321c161e7b21d90c7e69a340e7b263c2f52a43d12c56cc0c82c506de3' 
  AND token = 'xCPYi7McKWCrLK5LTEzE8tk6cHwzq909OAbQevNJhI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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