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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '768ce2bed408975407e07adb35f156ed0f13a4f49a999703c90b8e2d929dc572' 
  AND token = 'odEHv3TUlAHgKUW5stnTYGXfowEC+rwsJ69np1E8jCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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