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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eef8b58180b65e463bc1a6922e90fa48b9915ae544990b9cabc0817edfeb6b32' 
  AND token = 'wo4PmzN+oulAytSBB26fD+aEalIbY/G8iuBiJEHJH6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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