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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '655c08d8b3ed95f6937336bfc7d56d6bab22bdaec8c9dc391fdddb97c1730742' 
  AND token = 'wl0Bk5z6L8xKpBynYIrBjN9HU1xNYkc36C18rAKnQGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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