SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2994e49161dc326479e92b3b10471863da831ac998a67156e41f174e8d9b20b9' 
  AND token = 'WWxQzjYOZfzfMxKYQS2hV/05uZOKvzJ8GxFR/Ii/LWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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