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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a67e1fe85ed4ba472d39355f001300cc9fee1b5348a4907a7e3038c58df19ee' 
  AND token = '2ylO1OKKCQHA8K5qibhAESVbKxtnSo4qpgmL91/2Lxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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