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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ae6351f6905eeda7dfe17fa86a040a281e7d04bfbb074d5fca5190be4951b71' 
  AND token = 'KoyNlDoaJSLCwXrkPFj7U+qML91pJ5ofo0mzq5Us5N8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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