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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53ef12ad844cf5f1ecd0912f8ec9b2ae96337ea1f3ac38a702bb064748f25bec' 
  AND token = 'H9W9QhSeW+fpOe7C52zvmHayaPx0JxcY5Das6dgM56M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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