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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e98e2cbbd81e3438096274e95d4e30b82f363eef259904a58cf4a93f78997262' 
  AND token = 'xf31ki8rHFXhMX/RJb2MZyf3qOo/irwZO+FXnA5eYLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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