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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '882fbcda7e654ccbc669136ac3b63857ff607ac01e817505b6c33e5c1f7ef675' 
  AND token = 'IoBnpqA98k7UIUBz8XgkjPK4V/dyuhl/kU+In+dfkDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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