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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '902804a75925c59cc6e41dcd16e1c43c635af1ae2e15af701a8a8a687cc6cb9c' 
  AND token = 'Wji6Btgks0GmsbZDF9dwSJMooY9W4enV0oIa3cE/IeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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