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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09cc6b331c38602b4e2e8df63ed8333a43b5d41d45f76f50b11b8db718c32d8d' 
  AND token = 'AH8fwiJ4TvBc5AfMq5ub3Tr9lCFmMZnj3OeaY6xy7Wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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