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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ec3ce1feba4e9d0e72aa85f937872ca45a4dd2c5ae65f0060ffd0a9ea53cb13' 
  AND token = 'QJaFe0QoX9rdy9Fm7xPzrgKRCnj4LIt4JFfcdeVRMRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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