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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '703a85e88ea0251834fab0e04ca089507c618d7e5b559c56a622518e9ba66d06' 
  AND token = 'Wej8eT5bkgr+awZpGjbZVgVdhAgZMvbQYtwdD6VqHlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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