SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc4ef2ba660e65e7cab64a43bff33d90c4265118139a0ff98a22944ae5ecfc92' 
  AND token = 'M6NuIZiMz0+zq/2RlltGggTL5ncx0g+TvjxIjLwowYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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