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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ea82bedaf0937aa38eaf04a95e165204424627d2ebd1ee8f1f211065a57ad8a' 
  AND token = 'qZ02AVPFNZnvzBbDy5qKIvBKlFukpfMB++B+de71/ZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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