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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9447e9a18c838b7c0b3ef1947cd93f53532992b751e16ab26e17dc5e5bb89faa' 
  AND token = 'NgbJOjw5SNlIfU+uw2rRPjeb7VLWAl7j63C5l5Mqx6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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