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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b718a9e337756b742bb3f0080eaa3c9e407b76bc870eb1a8fcc67036d0f9f4c' 
  AND token = 'do9qOiYQCfpJlhwfGwN3wnlpfhCj4REzVTsIkaK9Big=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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