SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '980cbd6e55537b8eb3d65438056a1a1203d6050d46ee49d3b291848baac112d2' 
  AND token = 'lVdKkFLBD6zNjH2ZdNk+7XJ9GOm4i4Zh3lXxgDRirUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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