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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '696408766dc8cab80f1960981ff131ee4439282a0bf81b4c09d541743a5f6fef' 
  AND token = '0TScXagWPmjIPVLj0UMqKtWAuQvvQUCai/dM5LV0i3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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