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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f36a43f38da70d59f122e6f538840af7bb1723cd94a1501200c3478314f75f4b' 
  AND token = 'SJZfo4PZRAaY/oU5HHjkxJAyCMKVWZLIEyfJhuOR6mU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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