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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39f93b9720a531e8156e6d6b31aa6b92320425bcc1e4d5a232f654157072be1f' 
  AND token = 'ctFELl96jcSpYS7NpMcJP7kjVxeCTiOnAjUXP/wJRYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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