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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c815323b2b658578b85b8bd4584b5705be94d70b1a483f818ecdd8ead4628ea7' 
  AND token = 'yxRjWOkvb3udIxRApzM55p83sizuKghKzNx5v8oiJRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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