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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73d8f836089a95149ecc1734dd3e63f677a729e2c0818a117a37cef9a490b270' 
  AND token = '0uDzhp7O6b+T8nk4Lb6ovQdZ5UYEOq4pt5qMSFPZ4cI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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