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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '463e0f9ab1ad79b75547e8e0ebbf3f864f6b2788275476bdd3d59e739492850a' 
  AND token = 'BR/8da2pgh1AE+0JmiCa0Nzg+RgHpP+PcvVeEOOop4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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