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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beba6889dc414886ed21bd5fb4e8c2ad8fdfbbf4862f54a4faa8fa430d7e73be' 
  AND token = 'CzSs11XzND9/wN9A9F44F4Qf+6KwoRjVuNAzqtJaOPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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