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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05976d7381baff8b6d318bf7034f5d1ca36943b8067d5df18df311ca8f75c60b' 
  AND token = 'bQtxkS9RnZGwpTbfaytMs6SaH7xqUyj175PYcIA+w+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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