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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d4579cd54e051d9209b0d2791ecfa0b77166200a8c8cd29699775f09ca5e8d8' 
  AND token = '5NcbV96ssNaKVXQkEMQXyWANWo6hb3ECnTBu5uBDlAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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