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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98449d1fe20387aa21f1c17d069dbda543edb56762a04cd93fca4c8fae5debbf' 
  AND token = 'fFyQw9uOKB3C54UX8fUEiV9mePxONHgL80cZk/ZbgU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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