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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d8b10cad3f47afac1b25bc4f2ab49d066173fa91a48ab040c8f881e78c8b451' 
  AND token = 'Vh9hz9c8lk8FdnH7XXO5ywOKOXVUZh2NUrT9wvfthU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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