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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e03b17b89ea5ddf0bd86c977ef90145ef9d865c629fd9f823524870fc21c297c' 
  AND token = 'Is6DfZIsehq4osXCF9x1bxg1/otavv3uKXqagxtHmyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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