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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6af51703c3c0bad60fb58ccc8b8c46c0137c5734d73e924a1e9d3aa534f421f7' 
  AND token = 'MHKG7iMvkDyBfpGlq+1HVctr54Y/KeIBOgwHv5nDIOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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