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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b52069c4cab952f444bc87079682527b5ea49eff4e558d92a5b05a8c233d61b5' 
  AND token = 'zouVe6Qt6exa+v8VKcQpybWvSzNYcHZBtik5m9YVmuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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