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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f55e40559bc0330fe6e0b124cd6923e628add6806f70a67a6c67905bb8a3ec4' 
  AND token = 'jxlk2BUoiw60qCVLw+ozz6W2pYf9mV+4WTl7A84HjcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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