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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2b24d4a7bd79b6839e4921ab0392387c54a78418d1904520f4a9f39dd4aefda' 
  AND token = '49FdLlFb6I6CnCz5U+yQVbwouJa8yCGtcqeQLYsxwhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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