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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f59a3328b5f528c44a563dffd77c489e1cd8d332e9fc2ddfed9319c200d70c4' 
  AND token = 'WYi0s26WaoZnSvE8wdar2K3gNduEZuZHrDYhOXKs6Jg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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