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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1246bad610418ae9b000dc8d068dc5af4283a42b8112d9aa93fa6ea2a55277ec' 
  AND token = 't3feygz6fk+HsJlcxeQdcX60qEVn/6sYezJypHgDcc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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