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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '449498b99be0991560a60200ff69cdc2f42e31549ddf170c46f0d0bf79006fb0' 
  AND token = '5urNN+6CIi2BjFq5vRJijiTaHaE9RzvibVxnoVBe3B8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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