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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '446f6ae18215d95c5118ef2d3bbdf03b3458cf16dd68214907e788bb8414f2a6' 
  AND token = '+9/lhkGiQPyi8u3M5CzAx5jneDj7eraBj5/4JDAlJlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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