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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1086d4cd6a45d6ae57f149dba047b47c1ecf96ccfc147bd05749a250d0ae4a30' 
  AND token = 'Nc/wQZg3m3rY8BO+JwpO1sAiilitVz24k29tJwr/XjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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