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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cc075454bf9d2c1e626bf0129c0d74e4a590eb7818cc6fcf84743a8b230e072' 
  AND token = 'jxOW73er/S5Yx5AAYPtgBHY+XTYga6CFYey21/LeyOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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