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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a06ddd5cbbcb08067c9c9ed667a04e58fe78bfaeea224c05d9a3dd8e80046f7' 
  AND token = 'Cyyg6n6Lch/Gvq+MsisIX+Kvjg6Rt8krJ6prSdyfsr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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