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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '585f2ad4efe29bf161d69337ab0d771789cccd058f09f26be0062225ecf8b1a7' 
  AND token = 'E5Db86hI7Y3sF49x8PERxNlDwRI0yuYSrKyoXBg3TrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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