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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29723e93d3285af0cc8a2bc6f4c933239d5475d1a8ae509064200b5181df55fb' 
  AND token = 'WWAAxivJGuoR+mmcfgWEddWsGQfCpZDMc+a6rCAh2uU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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