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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5fb23e8afbfd7332efd5b5bc5800699ffeb79ef7ce024c98d6c57be4c8c3408' 
  AND token = '5nJjbLOTf/jochjSQHlwr4CW2QkFLeJxjagEeaXvl4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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