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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bbe001a10eb366556b138be6190966c93833c1392e850b71a5113e5ba058847' 
  AND token = 'HKr2w8azdVk0JQTvRDywp2dOh06G/egPy7xbG9cTonc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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