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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd3123af7ca361fd2663097f4f44c1e42321516041a6dc7c50b82300dd8c7122' 
  AND token = 'Gde/UNn7BoDPl6p04cKXolrxtX6c4G2txHAfXOlZz7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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