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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '599002579659b46614552dfe31ab29c74bad43958361ef90d3d711fe689181ff' 
  AND token = '2KkX40htBU8+UvJpE5lM3lWGctBORNd93WWAAAb7834=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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