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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb396774ced503fc38737acdac9c394a3f0502fc46a963857481088f435e6362' 
  AND token = 'A6uQf5a7x3O4OkdAimnRKXCfQV+85NIwsPpYz+9NnE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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