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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9510caf9f9e22d5ac05d5efcddab4b67ac29a18e4c7b63f795813ff78d272053' 
  AND token = 'aVN7iaIVLBd2+JKhXeh6xl95VIYi7F46b39epV1A78w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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