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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f41a59f34169b598d6c3dafa48f6500d7fc9438032abca79dc47b732753c762f' 
  AND token = 'OuK5DHwJPnCT52Ie/0XOWj2+Pe0va1LQO3A/yeI6ebA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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