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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18a9b10c2838a733a30d1e9f8c2ff1f5fefb330979a6f789cc6f2984a59720b8' 
  AND token = 'dvZZ//bpKOQS2Wknjo0PQ20wu1sORLmM/2EbkrfIxJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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